Bad Ratings and Positions in Portuguese League

Player's Ratings in the Portuguese League are a bit off. I can give you the example of Boavista. A player like Schembri is rated 75. I am portuguese and personally never heard of him. He scored 3 goals in 73 matches for Malta so you can see how high he is rated. You can compare him to Soares from Porto, that scored 16 goals in 22 matches, starting in the champions league, is rated 75 as well. Other problem I found was at Sporting. Bruno Cesar is a midfielder that rarely plays left back yet he is considered a defender. These are some examples of bad ratings and placements. Thank you.